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Onyx marble is a limestone formed by the minerals calcite or aragonite. Onyx got its name from a Greek word meaning "fingernail" because of its translucency. Onyx marble is always banded because it is formed in layers. These layers are deposited by hydrated calcium carbonate at warm springs, or as stalactites or stalagmites in limestone caves. Onyx marble is very soft, with a hardness of 3 on the Mohs' scale, making it a popular stone for carving. This onyx marble was fashioned into a worry stone by carvers in Mexico.

Picture is representative of the specimen you will receive. Each rock is unique and will vary in shape, size and appearance. No two rocks will be exactly alike.